Suspension system and method

ABSTRACT

Front and rear independent suspension mechanisms accommodating an increased range of motion to better absorb shock originating at the wheels of a riding mower to insulate the operator and reduce stress on the mower chassis and other mechanical components. The front suspension can include a front axle with pivot pockets allowing 360 degree rotation of pivots engaged within the pockets, thereby providing a greater range of absorption of shock entering the front axle at varying angles. The rear suspension can include a vertically pivoting transmission platform, providing for controlled vertical motion in the transmission while the transmission is powered by an engine by way of a belt assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/465,213, filed Mar. 21, 2017, now U.S. Pat. No. 10,421,356, which isa continuation of U.S. patent application Ser. No. 13/889,024, filed May7, 2013, now U.S. Pat. No. 9,597,957, which is a continuation-in-part ofU.S. patent application Ser. No. 13/840,070, filed Mar. 15, 2013, nowU.S. Pat. No. 9,161,490, which claims the benefit of and priority toU.S. Provisional Patent Application Nos. 61/677,288, filed Jul. 30,2012, and 61/643,809, filed May 7, 2012, the entire contents of each ofwhich are incorporated herein by reference.

BACKGROUND

The present invention is described with respect to its use on lawnmowers that can include rotating blades for cutting grass and othervegetation. For example, some conventional mowers can be configured asself-propelled mowers. A common problem associated with someconventional mowers is that they can produce uneven cuts and deliverunwanted stresses from the terrain to both the driver and mowerstructure, resulting in driver fatigue and discomfort, mower wear andtear, more frequent repairs, and a shorter mower life. Effectivesuspension concepts that have provided benefit to other types ofmotorized vehicles have not equally benefited riding mowers due tooffsetting suspension needs.

SUMMARY

In one embodiment, the disclosed rear suspension assembly includes afirst support having a first support first end, wherein a first bushingis affixed to the first support first end. The assembly also includes asecond support having a second support first end, wherein a secondbushing is affixed to the second support first end. Further, in someembodiments, the rear suspension assembly can include a third supporthaving a third support first end affixed to a first support second endand a third support second end affixed to a second support second end. Apivoting mechanism mounts the first support and the second support to ahorizontal chassis support.

In one embodiment, the pivoting mechanism includes a first mountingbracket having a first through hole and a second mounting bracket havinga second through hole, wherein the first mounting bracket is affixednear a first end of the horizontal chassis support and the secondmounting bracket is affixed in parallel to the first mounting bracketand near a second end of the horizontal chassis support. A steel pindowel is passed through the first bushing and the first through hole andthrough the second bushing and the second through hole such that thefirst support and the second support are pivotally connected to thehorizontal chassis support.

In another embodiment, the pivoting mechanism includes a first mountingbracket having a first socket and a second mounting bracket having asecond socket, wherein the first mounting bracket is affixed near afirst end of the horizontal chassis support and the second mountingbracket is affixed in parallel to the first mounting bracket and near asecond end of the horizontal chassis support. A first ball is fittedwithin the first socket and a second ball is fitted within the secondsocket, such that the first support and the second support are eachpivotally connected to the horizontal chassis support.

In yet another embodiment, the disclosed rear suspension assemblyincludes a single pivot suspension assembly that includes a firstsupport having a first support first end, wherein a first supportincludes a first inward bend within the upper half of the length of thefirst support. The single pivot suspension assembly further includes asecond support having a second support first end, wherein a secondsupport includes a second inward bend within the upper half of thesecond support. A pivot mechanism is affixed to the first support firstend and the second support first end, wherein the first support firstend and the second support first end meet due to the first inward bendand the second inward bend. Also, a pivot mechanism connector is affixedto a horizontal chassis support, wherein the pivot mechanism ispivotally attached to the pivot mechanism connector. In some furtherembodiments, the single pivot suspension assembly can include a thirdsupport having a third support first end affixed to a first supportsecond end and a third support second end affixed to a second supportsecond end.

Other features and advantages of the present invention will becomeapparent to those skilled in the art upon review of the followingdetailed description, claims, and drawings.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a rendering of a front suspension of a mower including a frontaxle relative to the front-end suspension mechanism according to oneembodiment of the invention.

FIG. 2 is a rendering of a front suspension of a mower including a frontaxle with pivot pockets according to one embodiment of the invention.

FIG. 3 is a rendering of a front suspension of a mower showing therotation of a pivot bushing within the pivot pockets according to oneembodiment of the invention.

FIG. 4 is a rendering showing a closer view of the pivot pockets in theaxle according to one embodiment of the invention.

FIG. 5 is a rendering showing a top angle view of a rear suspensionmechanism according to one embodiment of the invention.

FIG. 6 is a rendering showing a side view of a rear suspension mechanismaccording to one embodiment of the invention.

FIG. 7 is a rendering showing a rear view of a rear suspension mechanismaccording to one embodiment of the invention.

FIG. 8 is a rendering showing a bottom-up view of a rear suspensionmechanism according to one embodiment of the invention.

FIG. 9 is a rendering showing a top-down view of a rear suspensionmechanism detached from a mower chassis according to one embodiment ofthe invention.

FIG. 10 is a rendering showing a detail view of a transmission inputpulley and belt relative to a rear suspension mechanism according to oneembodiment of the invention.

FIG. 11 is a rendering showing a top-down view of a mower enginerelative to a rear suspension mechanism including a transmissionassembly according to one embodiment of the invention.

FIG. 12 is a rendering showing a side view of a mower engine relative toa rear suspension mechanism including a transmission assembly accordingto one embodiment of the invention.

FIG. 13 is a rendering showing a side view of a mower chassis includingan engine relative to a rear suspension mechanism and a transmissionassembly according to one embodiment of the invention.

FIG. 14 is a rendering showing a top-angled view of a mower rearsuspension mechanism including a transmission assembly relative to anengine according to one embodiment of the invention.

FIG. 15 is a rendering showing a top-angled view of a mower rearsuspension mechanism including a transmission assembly relative to anengine pulley according to one embodiment of the invention.

FIG. 16 is a rendering showing a top-down view of a mower enginerelative to a rear suspension mechanism including a transmissionassembly according to one embodiment of the invention.

FIG. 17 is a rendering showing a top-down view of a single point pivotrear suspension mechanism including a transmission assembly for a moweraccording to one embodiment of the invention.

FIG. 18 is a rendering showing a rear view of a single point pivot rearsuspension mechanism for a mower according to one embodiment of theinvention.

FIG. 19 is a rendering showing a side view of a mower single point pivotrear suspension mechanism with a connecting frame pivot according to oneembodiment of the invention.

FIG. 20 is a rendering showing a top-down view of a multi-point pivotrear suspension mechanism including a transmission assembly for a moweraccording to one embodiment of the invention.

FIG. 21 is a rendering showing a rear view of a multi-point pivot rearsuspension mechanism for a mower according to one embodiment of theinvention.

FIG. 22 is a rendering showing a side view of a mower multi-point pivotrear suspension mechanism with a connecting frame pivot according to oneembodiment of the invention.

FIG. 23 is a rendering showing a rear view of an independent pivot rearsuspension mechanism for a mower according to one embodiment of theinvention.

FIG. 24 is a rendering showing a rear view of a parallel pivot axis rearsuspension mechanism for a mower according to one embodiment of theinvention.

DETAILED DESCRIPTION

Before any embodiments of the invention are explained in detail, it isto be understood that the invention is not limited in its application tothe details of construction and the arrangement of components set forthin the following description or illustrated in the following drawings.The invention is capable of other embodiments and of being practiced orof being carried out in various ways. Also, it is to be understood thatthe phraseology and terminology used herein is for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” or “having” and variations thereof herein ismeant to encompass the items listed thereafter and equivalents thereofas well as additional items. Unless specified or limited otherwise, theterms “mounted,” “connected,” “supported,” and “coupled” and variationsthereof are used broadly and encompass both direct and indirectmountings, connections, supports, and couplings. Further, “connected”and “coupled” are not restricted to physical or mechanical connectionsor couplings.

The following discussion is presented to enable a person skilled in theart to make and use embodiments of the invention. Various modificationsto the illustrated embodiments will be readily apparent to those skilledin the art, and the generic principles herein can be applied to otherembodiments and applications without departing from embodiments of theinvention. Thus, embodiments of the invention are not intended to belimited to embodiments shown, but are to be accorded the widest scopeconsistent with the principles and features disclosed herein. Thefollowing detailed description is to be read with reference to thefigures, in which like elements in different figures may have similar ordifferent reference numerals. The figures, which are not to scale,depict selected embodiments and are not intended to limit the scope ofembodiments of the invention. Those of ordinary skill in the art willrecognize the examples provided herein have many useful alternativesthat fall within the scope of embodiments of the invention.

Some embodiments of the invention can include a front independentsuspension assembly that can be capable of being connected to a mower.In some embodiments, the front independent suspension assembly caninclude a front axle and a first bushing through-hole that can bepositioned right of center on a front-facing portion of the front axle.The first bushing through-hole can include a first rotatable bushingseated therein. In some embodiments, the first rotatable bushing caninclude a first slot to sufficiently seat a first inner bushing, so thatthe first inner bushing can move from a first slot first end to a firstslot second end. In some embodiments, a second bushing through-hole canbe positioned left of center on the front-facing portion of the frontaxle. The second bushing through-hole can include a second rotatablebushing seated therein. In some embodiments, the second rotatablebushing can include a second slot to sufficiently seat a second innerbushing, so that the second inner bushing can freely move from a secondslot first end to a second slot second end.

Some embodiments of the invention can include a rear independentsuspension assembly that is capable of being connected to a mower. Insome embodiments, the rear independent suspension assembly can comprisea first support including a first support first end that can include afirst bushing coupled to the first support first end. In someembodiments, a second support can include a second support first endthat can include a second bushing coupled to the second support firstend. In some embodiments, the rear independent suspension can include athird support including a third support first end coupled to a firstsupport second end and a third support second end that can be coupled toa second support second end. In some embodiments, the rear independentsuspension assembly can include a pivoting mechanism mounting.

Some embodiments presented herein can address one or more of theproblems and limitations of the prior art by incorporating unique frontand rear suspension assemblies capable of buffering at least a portionof the shock that is administered to the wheels, before the energyreaches the primary chassis. The disclosed suspension systems alsoprovide greater horizontal stability for the mower. In one embodiment, aunique suspension assembly is affixed to both the front and rear of themower chassis. In one embodiment, a front suspension assembly (i.e.,front axle) may be connected to the front of the chassis or near thelongitudinal center of the chassis, while the rear suspension assemblycan be connected to the sides of the chassis a distance from the rear ofthe chassis. Either or both suspension assemblies may be mounted to thechassis via pivots and/or joints secured to the chassis. Either or bothsuspension assemblies can be connected directly to wheels, shockabsorbers, and springs.

The combined front and rear suspension assemblies described hereinprovides for multi-dimensional wheel movement while maintaining chassisstability, which exceeds that which is currently available usingconventional suspension methods. For example, movement caused by anuneven surface may be partially isolated to the uniquely disclosed rearsuspension assembly through independent vertical movement of the reartires and transmission assembly. With the improved freedom of movementof the front axle, wheel contact with uneven ground, such as a steepupward or downward grade, is improved due to the front wheels being ableto move generally vertically without greatly altering the relationshipof the chassis with respect to the surface traversed, or at least withreduced movement of the chassis. In this manner, roll and pitch of thechassis can be significantly reduced, resulting in a higher-quality cutand improved comfort for the operator.

In these and other embodiments, the front and rear suspension assembliesare independent, and can be connected to a beam, sub-frame, or otherstructure that is pivotally coupled to the mower chassis, therebytransmitting upward, downward, and sideways force to the independentsuspensions, as well as to the pivoting beam, sub-frame, or otherstructure. Regardless of whether the cutter deck is also connected tothese independent suspensions, this arrangement can result in improvedsuspension and cutter deck movement.

FIG. 1 is a rendering of a front suspension of a mower including thefront axle relative to the front-end suspension mechanism according toone embodiment of the invention. The front-end suspension mechanism, orassembly, can include an axle 105 that can be moveably coupled (e.g.,pivotally coupled) to the chassis 100 by way of pivots, which will bediscussed in greater detail with reference to FIG. 2.

In some embodiments, the axle 105 can include a reinforced bolt hole 125to support a bottom portion of a shock absorber and/or spring. The shockabsorber and/or spring can be secured and compressed between the axle105 and the chassis 100 by way of a bracket 120 that can be attached tothe chassis 100. The bracket can include a bolt hole 120 for securingthe top portion of the shock absorber and/or spring.

In some embodiments, the axle 105 can be configured to include endmounted bushings 115, so that a wheel and steering assembly can bepivotally integrated within the bushings 115. Although the axle 105, asdescribed herein, includes improvements that will be described below,practitioners will appreciate that various steering mechanisms andmechanical configurations of can be used with embodiments of theinvention.

In some embodiments, the front suspension assembly and chassis 100 caninclude any number of additional fixtures and brackets for attaching,for example, a bumper or any other component. Although not enumerated,the drawings may illustrate such fixtures without specific description.Practitioners will appreciate that the figures may include such elementseven though they may not be pertinent to the improved suspensionassemblies disclosed herein. More specifically, these elements may beincluded in the drawings for the purpose of explanation only and to showthe placement of critical components relative to possible placements forplates, rods, bars, tabs, wings, extensions, bosses, platforms, struts,and other framework elements.

FIG. 2 is a rendering of a front suspension of a mower including thefront axle 200 with pivot pockets 205 according to some embodiments ofthe invention. As previously mentioned, the axle 200 can be configuredand arranged to be coupled to and/or support a steering assembly andfront wheels. In one embodiment, the axle 200 can include a bushing 215to allow a steering assembly to move (e.g., pivot from side to side)under the steering influence of the mower operator. Also, in someembodiments, the axle 200 can comprise any number of threaded and/orunthreaded reinforced bolt holes 220 for supporting additional mowerchassis elements including, for example, a front bumper.

In some embodiments, the axle 200 can include one or more pivot pockets210 to accommodate and secure a rotating bushing. In some embodiments,the axle can comprise a left-of-center pivot pocket 205 and aright-of-center pivot pocket 210 that can be positioned in order todistribute the load and stress resulting from the mass of the mowercomponents, motion, and mechanical vibration. In one embodiment, thepivot pockets 205, 210 can be formed (e.g., bored) and polished so thata bushing assembly can be inserted and maintained so that few or no gapsexist between an outer surface of the bushing and a pivot pocket innersurface area.

In some embodiments, the pivot pockets 205, 210 can be coated withand/or fitted with a synthetic material lining such as, for example,polypropylene. For example, such a material lining the pivot pockets205, 210 can reduce or eliminate the need for lubrication and/or mayfunction to absorb heat and vibration.

FIG. 3 is a rendering of a front suspension of a mower showing therotation of a pivot bushing within the pivot pockets according to oneembodiment of the invention. FIG. 3 provides a frontal view of the axle300 relative to some suspension and chassis components. The axle 300 canbe configured to allow multiple levels of vertical movement of the axle300 while maintaining the weight of the mower chassis, mechanicalcomponents, and operator. As described above, additional movement in theaxle 300 can provides increased shock absorption properties, therebyreducing structural stress and providing a more comfortable ride for theoperator.

Overall weight can be a factor in the manufacture of mechanicalequipment, but can be particularly relevant for machines that aremobile. As such, the selection of construction materials is often abalance between keeping the components as light as possible, whileenabling the components to withstand the rigors to which they willnormally be exposed. In some embodiments, the mower chassis 320 cancomprise a thin gauge steel with machined features (e.g., bends andcreases), which can significantly increases the strength of the chassis320, so that the chassis 320 is capable of supporting the shiftingweight of the various components when the mower is in use.

In some embodiments, the axle 300 can be configured and arranged toallow for movement. For example, shock absorbers and/or springs 325 canbe positioned on one or both sides of the axle 300 and can be connectedthereto by a bolt 330 passing through a bolt hole in the end of theshock absorber 325 and extending into a reinforced bolt hole in the axle300. The shock absorbers and/or springs 325 can function to reduce shockand vibration that can originate at the wheels and preventing the shockfrom traversing the mower chassis. Moreover, in some embodiments, theshock absorbers and/or springs 325 can stabilize the chassis 320, whichcan aid in maintaining a generally vertically upright posture even whenthe axle 300 is significantly tilted. The shock absorbers and/or springs325 can cause the axle 300 to return to a level configuration when thesurface beneath the wheels is primarily level.

As described in reference to FIG. 2, the axle 300 can include a pivotpocket 205, 210 that can be configured to maintain a rotating bushing305. As illustrated in FIG. 3, the bushing 305 can be seated within thepivot pocket. In one embodiment, the pivot pocket 205, 210, the bushing305, or both can be coated or lined with a material that cansignificantly reduce or eliminate the need for lubricants. For example,due to the high pressures asserted against the walls of the bushing 305,a material that can provide sufficient viscosity would be required towithstand significant frictional heat and pressure over a long period oftime. Such materials can comprise alloys, ceramics, silicones, andplastics.

In some embodiments, the bushing 305 can include bearings, so that therotating portion of the bushing 305 can move on small balls orcylinders, which can thereby reduce frictional stress to the bushing305. The bushing 305 can be maintained in a proper position relative tothe pivot pocket in any conventional manner. In one embodiment, thebushing 305 can include an outer sleeve (not shown), for example, thatcan extend beyond the depth of the pivot pocket 205, 210. The portionsof the sleeve extending beyond the front and back surfaces of the axle300 can be folded outward, which can secure the bushing 305 within thepivot pocket.

In some embodiments, the bushing 305 can include a slot 310, which canextend at least a portion of a thickness of the bushing 305. In someembodiments, the slot 310 can comprise an oval or ellipticalconfiguration. In other embodiments, the slot 310 can comprise othersuitable configurations. In one embodiment, the slot 310 can be centeredwith respect to the bushing 305 and can be formed (e.g., machined) tocomprise a tight tolerance and can include a polished internal surface.At its widest point, the slot 310 can be sized to accommodate a supportpost 315 that can extend through the bushing 305. The post 315 cancomprise any suitable material that can be sufficiently durable and willnot significantly flex or break under the weight and pressure of themower and its operator. In one embodiment, the support posts 315 canmaintain the entire weight of at least the front portion of the mower.

FIG. 4 is a rendering showing a closer view of the pivot pockets in theaxle according to one embodiment of the invention. In FIG. 4, the axle400 is illustrated so that the mower appears to be positioned on anincline, with the left end (front view) of the axle 400 beingsignificantly higher than the right side of the axle. By way of exampleonly, the front-right wheel supported by the axle 400 may be positionedwithin a trench, leaving a mower chassis 425 in a proper uprightposition with compensation for the uneven ground surface being providedby the axle 400.

With the axle 400 in the uneven position as illustrated, therelationship between the axle's pivot pocket, bushing 410, bushing slot405, and support posts 415 is more apparent. In some embodiments, theslotted bushing 410 can allow the bushings 410 to rotate substantiallyor completely independently, which can provide a greater degree ofmovement for the axle 400 because the support posts 415 can maintain aconstant position. Moreover, the slotted bushing can provide thesebenefits without degrading the integrity of the support system. Withoutthe rotating and slotted bushings 405, the illustrated straitup-and-down movement would be difficult to achieve while maintaining theweight of the mower on the posts 415. For example, in order to achievethe same or a similar pattern of movement without using the slottedbushings 405, the axle 400 could pivot on a single post extendingthrough the axle 400 through a single centered pivot pocket, which wouldrender the mower extremely unstable and prone to tipping to one side orthe other. Some embodiments allow two posts 415 to be used to supportboth the left and right sides of the mower, while still allowing the adegree of vertical movement to the axle 400.

FIG. 5 is a rendering showing a top angle view of a rear suspensionmechanism according to one embodiment of the invention. The provisioningof sufficient rear suspension in a conventional riding mower can be adifficult task because of the spatial conditions that include the engineand the transmission that are positioned in fairly close proximity.Although an independent suspension of the back tires of a mower couldhave been possible, a pivoting rear-wheel assembly providing verticalmovement to the entire rear axle has not been practical or efficient inconventional lawn equipment. The inability to pivot the entire rear axlearises from the need to position the transmission in a substantially orcompletely stationary position above the axle.

In one embodiment, the rear suspension assembly includes a number ofsupports that are pivotally connected to the mower chassis. Asspecifically shown in FIG. 5, the left support 510 is visible, which ispivotally attached to the chassis 500 by way of a bushing and dowel pin505. Also visible in this figure is the rear support 530 that mayinclude brackets 520 for attaching shock absorbers 525 and/or springs toprovide vertical movement control to the rear suspension assembly.

The support members 510, 530 are sufficiently sturdy to provide adequatesupport for the weight and movement of powertrain (minus the engine).This includes a transmission assembly that drives the rear axle 515,which ultimately provides bidirectional movement to the mower. Power forthat movement is transferred from the engine to a transmission inputpulley 540 by way of a drive belt 530.

FIG. 6 is a rendering showing a side view of the rear suspensionmechanism according to one embodiment of the invention. As described inreference to FIG. 5 above, the side perspective illustrates how atransmission assembly 605 can be securely mounted to a rear suspensionassembly 615, which can be positioned via one or more hinges 610 betweenthe transmission assembly 605 and the engine. In some embodiments, shockabsorbers and/or springs 625 can enable controlled movement of the rearsuspension assembly 615 and can return the assembly 615 to a normalposition when the mower is operated or parked on a level surface.

Another advantage to the rear suspension assembly as illustrated in FIG.6 is that the transmission assembly 605, which represents a significantproportion of a mower's overall weight, is included in the moveableassembly. As such, the transmission is largely unable to amplify mowermovement and vibration, as would a rigidly connected transmission.

Some conventional mowers that include a separate engine and transmissiontransfer power from the engine to the transmission by way of a drivebelt that wraps around engine and transmission pulleys. Due to thedistance between the engine and the transmission 605 according to thepresent embodiment; the vertical movement of the transmission 605creates very subtle variances in the angle of the drive belt. Forexample, a longer belt path creates a more subtle change in the belt'sangle. As such, some embodiments of the invention can experience lessbelt and pulley stress over time relative to belt and pulley stress insome conventional mowers (e.g., mowers including a belt that traversespulleys that are significantly out of alignment with each other).Moreover, a belt that rotates between pulleys that are significantly outof alignment can be more prone to slip off of one or both of thepulleys.

FIG. 7 is a rendering showing a rear view of the rear suspensionmechanism according to one embodiment of the invention. In someembodiments, the transmission can be shielded by a cover 700 that canprovide hinged access to the transmission while protecting the user fromheat and moving components including, for example, the drive pulley,drive belt, and cooling fan.

In various embodiments, the rear suspension assembly can include one ormore guards or shields that can be configured to protect the operator orshield sensitive electrical and mechanical components from exposure todirt, heat, or tampering. For example, the rear suspension assembly mayinclude a lower shield 710 that can protect the lower components of thetransmission.

In some embodiments, the transmission assembly can be positioned on therear suspension assembly, which can be subject to vertical movement thatcan generally originate at the tires and can be transferred to the axle705. The axle 705 can be attached to the rear suspension assembly at aposition where springs and/or shock absorbers 715 may absorb some or allof the vertical movement, without having the full movement transferredto the mower chassis.

FIG. 8 is a rendering showing a bottom view of the rear suspensionmechanism according to one embodiment of the invention. The pivot points805 for the rear suspension assembly can include a bushing 805 affixedto support bracket 800 and support bracket 830. The support brackets,including 800, 830 and 825 can be coupled to each other to maintain theweight of the transmission assembly 815 while being subject to verticaland horizontal shock. In some embodiments, the pivot point 805 can allowthe support brackets 800, 830 to be pivotally attached to the mowerchassis by a dowel pin 810, so that a certain amount of vertical motionin the rear suspension assembly can be permitted while protecting theattached components from damaging movement and vibration.

In some embodiments and some conventional systems, the transmission 815is one of the components that can be subjected to shock because of theconfiguration requiring the transmission 815 to transfer power from themower engine to the drive axle 820. The pivoting rear suspension, asdisclosed herein, can at least partially protect the transmission 815 byenabling controlled motion of the transmission 815 relative to the rearsuspension.

FIG. 9 is a rendering showing a top angle view of the rear suspensionmechanism detached from the mower chassis according to one embodiment ofthe invention. In accordance with this view, the rear suspensionassembly is illustrated as being disconnected from the chassis, therebyproviding a clear view of the disclosed suspension assembly.

As described relative to the previous figures, the rear suspensionassembly comprises two support brackets 915, which can be coupledtogether using at least a third support bracket 900. Practitioners willappreciate that this configuration is presented as one embodiment andthat other configurations for support brackets and modification of theshape of the rear suspension assembly is possible to meet end user ormanufacturer needs. For example, the rear suspension assembly caninclude a fourth support bracket (not shown) that can be positioned nearthe mounting plate 925 to further add to assembly stability. However,for the purpose of minimizing the overall weight of the suspensionassembly, additional support brackets may be omitted as they may not benecessary to the integrity of the structure.

The mounting plate 925 enables coupling of the rear suspension assemblyand a mower chassis by way of insertion of a dowel pin 920, which canallow the suspension assembly to pivot. The pivoting motion can besoftened and limited by shock absorbers 945 or springs that are mountedto the rear suspension assembly by a mounting bracket 905 that can bewelded and/or bolted to a rear support bracket 900.

In some embodiments, extending beyond the width of the side supportbrackets 915, the axle 910 can be configured to maintain and providemotion to the mower's rear wheels. To provide forward and backwardmotion to the axle 910, the transmission 935 can includes a series ofgears and other hardware for converting rotary engine movement todirectional movement (i.e., the transmission 935 can comprise asubstantially conventional transmission configuration). That movement istransferred by way of a drive belt 930 that connects an engine pulley tothe transmission input pulley 940.

FIG. 10 is a rendering showing a detail view of the transmission inputpulley and belt relative to the rear suspension mechanism according toone embodiment of the invention. In this close-up perspective, themounting bracket 1000 can be seen for securing the dowel pin that can beinserted through bushings in the rear suspension assembly. Atransmission control arm 1005 is shown for allowing the mower operatorto control the general speed and direction of the mower. Power istransferred from the engine to the transmission, which is secured on therear suspension assembly, by way of a drive belt 1015 that can wraparound the transmission input pulley 1010.

FIG. 11 is a rendering showing a top-down view of the mower enginerelative to the rear suspension mechanism including the transmissionassembly according to one embodiment of the invention. In accordancewith this view, the general distance between the engine 1100 and thetransmission 1105 situated on the rear suspension assembly 1110 can bemore clearly discerned.

As previously described, in some embodiments, the greater the distanceor length of the drive belt 1115, the lesser overall impact a shift inthe positioning of the transmission input pulley 1120 will have. As therear suspension assembly 1110 moves vertically in response to theterrain, the elevation of the attached transmission 1105 can be changedby small amounts relative to some conventional mower systems. As such,the angle of the drive belt 1115 can often change but by relative smalldistances. Moreover, as the transmission 1105 moves, the tension of thedrive belt 1115 can be varied. Therefore a tensioner assembly 1130 canbe employed to ensure that the drive belt 1115 tension remainssubstantially or completely constant, thereby lessening any affect thatthe moving transmission 1120 may have during mower operations.

FIG. 12 is a rendering showing a side view of the mower engine relativeto the rear suspension mechanism including the transmission assemblyaccording to one embodiment of the invention. This side perspectiveillustrates the engine pulley 1205 positioned so that the drive belt1210 comprises a generally planar configuration, relative to thetransmission input pulley 1215 of the transmission 1220.

In some embodiments, the engine 1200 can be positioned adjacent to afront of the mower and the engine shaft includes a pulley 1235 that canbe configured to provide power to a cutting assembly (not shown). Themower can also include operator controls 1240 for controlling themower's speed and direction and the rear suspension assembly mountingbracket 1245 can be mounted to the chassis of the mower. The dowel pin1250 can couple the suspension assembly bushings 1245 and the mowerchassis, while allowing the suspension assembly 1270 substantially orcompletely independent movement that may be governed and dampened byshock absorbers and/or springs 1260 attached to a suspension assemblysupport bracket 1265 and the mower chassis.

FIG. 13 is a rendering showing a side view of the mower chassis 1300including the engine 1305 relative to the rear suspension mechanism 1310and the transmission assembly according to one embodiment of theinvention. This figure provides generally the same view as that shown inFIG. 12; however, the mower chassis 1300 is shown, which conceals someof the components discussed above.

FIG. 14 is a rendering showing a top-angled view of the mower rearsuspension mechanism 1400 including the transmission assembly 1405relative to the engine 1410 according to one embodiment of theinvention. This view provides a perspective view of the engine 1410relative to the rear suspension assembly 1400 and transmission 1405.

FIG. 15 is a rendering showing a top-angled view of the mower rearsuspension mechanism 1500 including the transmission assembly 1505relative to the engine pulley 1510 according to one embodiment of theinvention. The transmission input pulley 1515 can receive power from themower engine drive pulley 1510. In some embodiments, the transmissioninput pulley 1515 can be positioned a distance away from the enginedrive pulley 1510 so that relatively small variances in the verticalposition of the pulley 1515 (i.e., due to movement of the suspensionassembly 1500) does not significantly alter the horizontal belt 1520angle.

FIG. 16 is a rendering showing a top-down view of the mower enginerelative to the rear suspension mechanism 1620 including thetransmission assembly 1610 according to one embodiment of the invention.The path of the dive belt 1600 is illustrated relative to the enginedrive pulley 1605 and the transmission input pulley, which is obscuredby the transmission 1610. As previously mentioned, in some embodiments,the drive belt tensioner assembly 1615 can ensure that the belt 1600maintains a constant tension despite the position of the transmissioninput pulley. The rear suspension assembly 1620 can be pivotallyconnected to the mower chassis using the bushings 1625 and dowel pin1630.

In some embodiments, the transmission 1610 can include a drive shaft1635 that can be part of the drive train. Various configurations arepossible for positioning a transmission relative to the engine and axle.For example, the axle can be physically separated from the transmissionand power may be transferred from the transmission to the axle by way ofa drive shaft and differential. However, in scenarios where space islimited, a single transmission 1610 with an integrated axle 1635 canprovide an acceptable configuration.

In some embodiments, a control arm 1640 can extend from a set ofoperator controls 1645 to the transmission 1610 in order to providecontrol to the transmission 1610, so that the direction and speed of themower can be controlled. The operator controls 1645 can include, forexample, a clutch and gear selector, which can allow the operator tocontrol mower speed and torque by causing the transmission 1610 todynamically switch between gearing ratios.

FIG. 17 is a rendering showing a top-down view of a single-point pivotrear suspension mechanism including the transmission assembly for amower according to one embodiment of the invention. For example, thesupport brackets 1725 of the rear suspension assembly 1700 can be angledinward to meet at a central point where an attachment assembly 1705 isconfigured to couple together the rear suspension assembly 1700 and themower chassis.

In some embodiments, the rear suspension assembly 1700 can be attachedto the chassis by a single pivot point 1705. Moreover, the pivot point1705 can allow a range of motion for the rear suspension assembly 1700.The pivot point 1705 can comprise a ball-and-socket style attachment ora bushing and dowel pin assembly. In some embodiments, the single pivotpoint 1705 can enable the rear axle to move (e.g., rotate) about thecenterline of the mower chassis, which can enable the tires 1720 on theaxle to be in contact with the ground surface during operations of themower, including when the grade for one tire 1720 is different than thegrade for the other tire 1720.

In some embodiments, the rear suspension assembly 1700 can be configuredand arranged to move vertically as a single unit, as described in theprevious embodiments. In some embodiments, sides of the rear suspensionassembly 1700 can move vertically and independently of one anotherbecause of the pivot point 1705 or single point of connection to thechassis.

While the purpose of the disclosed suspension assemblies can be to allowthe centerline of the mower wheels to move vertically with respect tothe chassis, it can be undesirable to allow them to move in otherdirections (e.g., longitudinally and/or laterally). In some embodiments,a support member (e.g., a panhard rod) can be positioned in the sameplane as the axle, and it can connect one end of the axle to the chassison the opposite side of the chassis. The support member can be attachedon either end with pivots that permit it to swivel upwards and downwardsonly, so that the axle is allowed to move in the vertical plane.

Also shown in FIG. 17 is the transmission input pulley 1710, whichreceives rotational power from the engine by way of a drive belt. Thefunction of the transmission is generally known by those of ordinaryskill in the art, but essentially; the transmission converts the kineticenergy received at the transmission input pulley 1710 to the desiredand/or needed torque and speed in order to apply the appropriaterotational movement to the axle.

FIG. 18 is a rendering showing a rear view of a single-point pivot rearsuspension mechanism 1800 for a mower according to one embodiment of theinvention. In some embodiments, the single pivot point can enable theaxle to rotate about the centerline of the mower 1805. To increasestability, shock absorbers and/or springs 1810 can be used to provideadded stability. In some embodiments, the rear suspension mechanism 1800can comprise a panhard rod 1815 to provide additional stability. Asshown in the figure, a left side of the rod 1815 can be attached to theaxle and the right side is attached to the chassis.

FIG. 19 is a rendering showing a side view of a mower single-point pivotrear suspension mechanism 1900 with a connecting frame pivot accordingto one embodiment of the invention. In some embodiments, one or moresupports 1920 can be positioned so the supports 1920 begin to angleinward at a point along the length of the supports 1920, so that theymeet at a point where a mechanism may secure the suspension assembly1900 to a connecting bracket 1925 on the mower chassis.

In some embodiments, when a rear tire 1915 encounters an uneven surface,the axle 1910 can be move 1905 (e.g., vertically oscillate). As such,the transmission, which can be suspended by the support brackets, canalso vertically oscillate in in substantial or complete synchronicitywith the axle. In some embodiments, this configuration can allow therear suspension assembly 1900 to absorb the shock of ground surfaceimperfections, and the operator can be provided with a more comfortableride and other critical components of the mower are sparedlife-shortening movements.

FIG. 20 is a rendering showing a top-down view of a multi-point pivotrear suspension assembly 2000 including the transmission assembly for amower according to one embodiment of the invention. In some embodiments,the support brackets 2015 of the rear suspension assembly 2000 can beindependently coupled to a corresponding assembly that can be configuredto couple together the rear suspension assembly 2000 and the mowerchassis.

In some embodiments, the pivot points can allow a range of motion forthe rear suspension assembly 2000 where the rear suspension assembly2000 is attached to the chassis by multiple pivot points 2020, 2025. Insome embodiments, the pivot points can also maintain a more rigidconnection to the chassis. One or both of the pivot points 2020, 2025can comprise a ball-and-socket style attachment or a bushing and dowelpin assembly.

In accordance with some embodiments, the rear suspension assembly 2000can be configured to move vertically as a single unit, as described inthe previous embodiments. The pivot points 2020, 2025 can movevertically and independently from each other. In one embodiment, a pivotpoint comprising a ball and socket type connection can provide a greaterrange of motion than the bushing and dowel pin embodiment.

As previously described, although some embodiments of the invention canenable the wheels of the mower to move vertically with respect to thechassis, it can also be undesirable to allow them to move in otherdirections (e.g., longitudinally and/or laterally). While themulti-pivot point embodiment may further stabilize the rear suspensionassembly 2000, in one embodiment, a panhard rod 2010 can be positionedin the same plane as the axle, connecting one end of the axle to thechassis on the opposite side of the chassis. The panhard rod 2010 can beattached on either end with pivots that permit it to move in generallyone plane (e.g., upwards and downwards).

FIG. 21 is a rendering showing a rear view of a multi-point pivot rearsuspension assembly 2100 for a mower according to one embodiment of theinvention. The multiple pivot points 2020, 2025 can allow the axle torotate about the centerline of the mower 2105. In some embodiments, toincrease stability, shock absorbers and/or springs 2115 can be used toprovide added stability. Moreover, in some embodiments, as previouslymentioned, additional stability may be provided through implementationof a panhard rod 2110. As shown in the figure, the left side of the rod2110 can attached to the axle and the right side can be attached to thechassis.

FIG. 22 is a rendering showing a side view of a mower multi-point pivotrear suspension assembly 2200 with a connecting frame pivot according toone embodiment of the invention. In one embodiment, one or more supportsare utilized for the rear suspension assembly 2200, but the supports2205 and 2210 can be mounted individually to the mower chassis.

In one embodiment, when the rear tire 2215 encounters an uneven surface,the axle can move (e.g., vertically oscillate), as reflected by arrow2220. As such, in some embodiments, the transmission, which is suspendedby the support brackets, can also vertically oscillate in unison withthe axle. By allowing the rear suspension assembly 2200 to absorb theshock of ground surface imperfections, the operator can be provided witha more comfortable ride and other critical components of the mower arespared life-shortening movements.

FIG. 23 is a rendering showing a rear view of an independent pivot rearsuspension mechanism for a mower according to one embodiment of theinvention. In one embodiment, each rear tire 2330 a, 2330 b can beindependently coupled to the frame mounted transmission assembly 2340.For example, as shown, rear tire 2330 a can be coupled to thetransmission assembly 2340 via a drive axle 2320 a, and rear tire 2330 bcan be coupled to the transmission assembly 2340 via a drive axle 2320b. In some embodiments, each independent drive axle 2305 a and 2305 bcan be coupled to the rear tires 2330 a, 2330 b and transmissionassembly 2340 using a flexible joint connection. For example, in someembodiments, the flexible joint connections can comprise a conventionalU-joint. In other embodiments, the flexible joint connections cancomprise a conventional CV-joint. Other embodiments of the invention canutilize other conventional flexible joints suitable for transferringtorque to the rear tires 2330 a, 2330 b.

In one embodiment, when either rear tire 2330 a, 2330 b encounters anuneven surface, either one or both rear tires 2330 a, 2330 b can moveindependently on the their respective axles 2320 a (shown as oscillation2305 a about coil-over shock 2315 a) and 2320 b (shown as oscillation2305 b about coil-over shock 2315 b). As such, in some embodiments, thetransmission mounted to a frame can remain stationary while either oneor more rear tires 2330 a, 2330 b can oscillate. By allowing the rearsuspension assembly 2300 to absorb the shock of ground surfaceimperfections independently, the operator can be provided with a morecomfortable ride and other critical components of the mower are sparedlife-shortening movements.

Some embodiments can include rear suspension assemblies with alternativepivot configurations. For example, FIG. 24 is a rendering showing a rearview of a substantially parallel pivot axis rear suspension assembly2400 for a mower according to one embodiment of the invention. As shown,some embodiments can include a subframe assembly 2420 that pivots on asupport axis 2440 substantially parallel to the longitudinal axis of themain frame 2410. In some embodiments, this configuration enables thesubframe assembly 2420 to oscillate about the axis 2440 a. As shown, theassembly 2400 can include a subframe with a first support member 2422and a second support member 2424. In some embodiments, the subframeassembly 2420 can be coupled to the support axis 2440 using a triangularplate connect or as shown, where the plate 2450 is coupled to thesubframe 2420 at a first end 2422 a of the first support member 2422 anda first end 2424 a of the second support member 2424 and the main frame2410 at the support axis 2440. In some embodiments, conventional bars orrods can be substituted for the plate 2450, for example, threeconventional rods or bars can be coupled at their ends at the first ends2422 a, 2424 a and the support axis 2440 to form a substantiallytriangular-shaped coupling between the subframe 2420 and the mainframe2410 to allow the subframe 2420 to oscillate along about the axis 2440a.

Furthermore, the various embodiments of the present invention shown inthe figures can include alternate elements and alternate structure thatare different in appearance and/or form than those illustrated, but thatstill perform the same or similar functions. Such alternate elements andstructure fall within the spirit and scope of the present invention.

The present invention is also applicable to lawn mowers having more orfewer than four wheels and to lawn mowers designed for the operator towalk or ride behind or in front of the mower. By way of example only,the present invention finds applicability to walk-behind mowers, pushmowers, and mowers with seats cantilevered forward or rearward of thefront or rear wheels, respectively.

Accordingly, the embodiments described above and illustrated in thefigures are presented by way of example only and not intended as alimitation upon the concepts and principles of the present invention. Assuch, it will be appreciated by one having ordinary skill in the artthat various changes in the elements and their configuration andarrangement are possible without departing from the spirit and scope ofthe present invention as set forth in the appended claims.

It will be appreciated by those skilled in the art that while theinvention has been described above in connection with particularembodiments and examples, the invention is not necessarily so limited,and that numerous other embodiments, examples, uses, modifications anddepartures from the embodiments, examples and uses are intended to beencompassed by the claims attached hereto. The entire disclosure of eachpatent and publication cited herein is incorporated by reference, as ifeach such patent or publication were individually incorporated byreference herein. Various features and advantages of the invention areset forth in the following claims.

The invention claimed is:
 1. A suspension and drive assembly capable ofbeing coupled to a chassis of a mower, the suspension and drive assemblycomprising: an engine supported by the chassis; a first supportpivotable relative to the chassis about a first end; a second supportpivotable relative to the chassis about a second end; a transmissioncoupled to and supported by the first support and the second support,the transmission configured and arranged to be driven by a belt coupledto the engine; at least one wheel configured to be driven by thetransmission; and wherein the at least one wheel and the transmissionare configured to vertically oscillate relative to the chassis and theengine.
 2. The suspension and drive assembly of claim 1, wherein thetransmission is coupled to a support bracket including a shock absorbercoupled to the chassis.
 3. The suspension and drive assembly of claim 2,wherein at least a portion of the transmission is positioned between twoshock absorbers.
 4. The suspension and drive assembly of claim 1, wherethe transmission includes an input pulley coupled to the belt.
 5. Thesuspension and drive assembly of claim 4, wherein the engine includes anengine pulley coupled to the belt, wherein the input pulley isconfigured and arranged to be driven by the belt coupled to the enginepulley.
 6. A suspension and drive assembly capable of being coupled to achassis of a mower, the suspension and drive assembly comprising: afirst support including a pivot, the pivot comprising a bushing to allowa pivotable motion relative to the chassis; a transmission coupled tothe pivot and configured and arranged to be driven by a belt coupled toan engine at least, the transmission coupled to a support bracketincluding a shock absorber; at least one wheel configured to be drivenby the transmission; wherein the chassis supports the engine; andwherein the at least one wheel and the transmission re configured tovertically oscillate relative to the chassis and the engine.
 7. Thesuspension and drive assembly of claim 6, wherein at least a portion ofthe transmission is positioned between two shock absorbers.
 8. Thesuspension and drive assembly of claim 6, where the transmissionincludes an input pulley coupled to the belt.
 9. The suspension anddrive assembly of claim 8, wherein the engine includes an engine pulleycoupled to the belt, wherein the input pulley is configured and arrangedto be driven by the belt coupled to the engine pulley.
 10. Thesuspension and drive assembly of claim 6, wherein the transmission ispositioned between a drive pulley of the engine and the pivot.
 11. Thesuspension and drive assembly of claim 6, wherein the pivot comprises asecond bushing coupled to a second support first end.
 12. A suspensionand drive assembly capable of being coupled to a chassis of a mower, thesuspension and drive assembly comprising: at least one rear wheel; afirst support pivotable relative to the chassis; a second supportpivotable relative to the chassis; an engine supported by the chassis; atransmission including a transmission input pulley and at least onedrive shaft coupled to the at least one rear wheel, the transmissionsupported by the first support and the second support; a drive beltcoupled to the input pulley; and wherein the at least one rear wheel andthe transmission are configured to vertically oscillates relative to thechassis and the engine.
 13. The suspension and drive assembly of claim12, wherein the engine is a lawnmower engine, and wherein the drive beltis coupled to and driven by the lawnmower engine.
 14. The suspension anddrive assembly of claim 13, wherein the transmission is coupled to atleast one shock absorber.
 15. The suspension and drive assembly of claim14, wherein the at least one shock absorber includes one or moresprings.
 16. The suspension and drive assembly of claim 13, wherein whenthe at least one rear wheel vertically oscillates relative to thechassis, the first support, the second support, the transmission, andthe drive belt are configured to vertically oscillate relative to thechassis.
 17. The suspension and drive assembly of claim 16, furthercomprising: a tensioner assembly, the tensioner assembly configured tokeep tension in the drive belt constant.
 18. The suspension and driveassembly of claim 13, further comprising a third support coupled to thefirst support and the second support.
 19. The suspension and driveassembly of claim 18, wherein when the at least one rear wheelvertically oscillates relative to the chassis, the first support, thesecond support, the transmission, and the third support are configuredto vertically oscillate relative to the chassis.
 20. The suspension anddrive assembly of claim 13, further comprising a shield configured toprotective the components of the suspension and drive assembly fromdamage.